JPH1177200A - Material feed device of press machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily conduct adjustment even in the case release timing of a feed roll is changed with respect to a roll type material feed device. SOLUTION: A feed roll 4 is mounted to one end of an oscillation arm 2 and a cam follower 3 to the other end, voltage is impressed between the release cam 1 arranged above the cam follower 3 of a material feed device and the cam follower 1, the contact of both is detected by the electric current flowing between both, by receiving a crank rotation position signal from a rotation position sensor 12 and arranging a sensor 9 to index a crank angle at a time of causing contact between the release cam 1 and the cam follower 3, the angle is displayed on a display device 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a material feeder for a press, and more particularly to an improvement in a roll type material feeder.

[0002]

2. Description of the Related Art In the case of press working in which punching, bending, and the like are performed on a plurality of stages while feeding a plate-like material, the material is usually sequentially sent to each stage by rotating a roll (see FIG. 3). However, in order to further correct a slight displacement in each stage, the pilot pin is connected to the material 7 shown in FIG.
The positioning operation for inserting the pilot hole 17 into the pilot hole 17 is performed. This positioning operation is performed in conjunction with a release operation of separating the roll from the material after the end of the material feeding by the roll.

FIG. 3 shows an example of a roll-type material feeding device. A material 7 such as a plate material is sandwiched between a release-side feed roll 4 and a fixed-side feed roll 6, and is fed by rotation of both rolls. The release-side rotating roll 4 is attached to one end of the swing arm 2, has a cam follower 3 at the other end, and is pivotally supported at the center to form a fulcrum 2a. And this fulcrum 2
The swing arm 2 can move up and down around a. Since the cam follower 3 rotates in synchronization with the rotation of the crank when the release cam 1 provided above the cam follower 3, the protrusion 1a provided on the outer periphery thereof abuts periodically, and the cam follower 3 is pressed downward each time. On the other hand, the release-side feed roll 4 is periodically swung upward to perform a release operation. Reference numeral 5 denotes a spring, and the feed roll side of the swing arm 2 is constantly pressed downward by the spring 5.

[0004] Usually, in the case of a mechanical operation, a feed roll and a cam for releasing the feed roll are driven by a crank as a driving force, and the feed operation is synchronously performed with the crank. In the case of NC, as shown in FIG. 4, a rotational position of the crank 13 of the press machine is detected by a rotational position detector 12 such as a rotary encoder, and a servo motor which receives this signal and synchronizes with the rotation of the crank is used. , The timing of sending out the feeder, and the release operation. In FIG. 4, reference numeral 14 denotes a feeder control unit for controlling the material feeding device, and 15 denotes a material feeding device.

[0005]

The above-mentioned material feeding device is
When the thickness of the material 7 changes, or when the release cam 1 or the cam follower 3 or the feed rolls 4 and 6 are worn, the distance between the release cam 1 and the cam follower 3 changes. Release timing changes. In particular, when such a change occurs when the material is thin, the pilot pin penetrates the material at a position other than the pilot hole 17, so that the positional relationship between the release cam 1 and the swing arm 2 and the release The rotation angle of the cam must be readjusted. This adjustment is very troublesome even if a rotational position detector such as a rotary encoder is provided on the release cam, because it is difficult to detect a slight change in angle.

Accordingly, an object of the present invention is to make it possible to easily adjust the release timing of the feed roll even if the distance between the release cam and the cam follower changes in the feeder.

[0007]

According to a first aspect of the present invention, there is provided a material feeder for a press machine, comprising:
The rollers supported in a state pressed against the conveying path surface are periodically separated from the conveying path surface by a cam and a cam follower that move toward and away from each other, and intermittently feed the plate-like material loaded on the conveying path surface. In the material feeding device, at least one of the cam and the cam follower is insulated from the device main body, a voltage is applied between the two, and a contact operation between the cam and the cam follower can be detected by using an energizing phenomenon. It is characterized by doing.

According to a second aspect of the present invention, there is provided a material feeding device for a press machine, wherein a rotational position detecting means is provided on a crank, and a rotational position signal of the crank and an energizing phenomenon between the cam and the cam follower are provided. Thus, a detection means for detecting the rotation angle of the crank when the cam and the cam follower come into contact with each other, and a display means for displaying the rotation angle are provided.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a configuration diagram of a main part of a material feeding device of a press according to the present invention, and the same members as those in FIG. 3 are denoted by the same reference numerals.

A configuration different from that of FIG. 3 will be described. A power source 11 is connected between the release cam 1 and the swing arm 2, and a voltage is constantly applied. Reference numeral 9 denotes a detector, which detects a current flowing from the power supply 11 when the release cam 1 and the cam follower 3 come into contact with each other, and detects the contact between them, that is, the release timing of the release-side feed roll 4. Then, the rotational position detector 12 (shown in FIG. 4)
, The crank rotation angle at the time of contact between the release cam 1 and the cam follower 3 is determined. However, the cam follower 3 and the swing arm 2 are electrically connected to each other, and the swing arm 2 is connected to the fulcrum 2a on the apparatus body side so that the release cam 1 and the cam follower 3 do not conduct through the shaft. Insulated from the spring 5. still,
The position of insulation may insulate the release cam 1 side,
Both the release cam and the cam follower 3 may be insulated from the main body. Reference numeral 10 denotes a display, which displays the rotation angle of the crank at the time of contact between the release cam 1 and the cam follower 3 determined by the detector 9.

In this manner, the release cam 1
The timing of contact between the cam follower 3 and the cam follower 3 can be accurately detected. By displaying the crank angle at the time of release, the release timing can be readjusted while looking at the display without having to worry about the rotation angle of the release cam 1. Therefore, the adjustment can be easily and accurately performed.

In the above embodiment, a voltage is applied between the release cam 1 and the swing arm 2, but a voltage may be directly applied between the release cam 1 and the cam follower 3. In this case, the swing arm 2 may be insulated from the main body, or the shaft bearing of the cam follower 3 may be supported by an insulating material. In addition, the release operation of the release-side feed roll may be performed directly without using the swing arm. For example, the rotation shaft of the release-side feed roll may be moved up and down by a release cam. Further, the present invention can be applied to a release operation of a gripper-type feeding device other than the roll type, and the release timing can be automatically adjusted by attaching a servomotor or the like to the adjustment unit. In addition, the shape and configuration of each part can be appropriately changed and embodied without departing from the spirit of the present invention.

[0013]

As described in detail above, according to the first aspect of the present invention, the timing of contact between the cam and the cam follower can be accurately known, so that the release timing can be adjusted with high accuracy.

According to the second aspect of the present invention, since the crank angle at the time of releasing the feed roll can be known,
The release timing can be easily and accurately adjusted.

[Brief description of the drawings]

FIG. 1 is a main part configuration diagram of a material feeding device of a press machine showing an example of an embodiment of the present invention.

FIG. 2 is a view showing a material provided with a hole for inserting a pilot pin.

FIG. 3 is a main part configuration diagram of a conventional material feeder of a press machine.

FIG. 4 is a block diagram showing a control mechanism of a conventional material feeding device.

[Explanation of symbols]

1. Release cam, 2. Oscillating arm, 3. Cam follower, 4. Release side feed roll, 6. Fixed side feed roll, 9. Detector, 10. Display, 11.
Power supply, 12 rotational position detector, 13 crank.

Claims (2)

[Claims] 1. A plate-like material loaded on a conveying path surface, wherein rollers supported in a state pressed against the conveying path surface are periodically separated from the conveying path surface by a cam and a cam follower that move toward and away from each other. In a material feeder capable of intermittently feeding, at least one of the cam and the cam follower is insulated from the apparatus main body, a voltage is applied between the two, and a contact operation between the cam and the cam follower utilizes an energizing phenomenon. A material feeder of a press machine that can be detected. 2. A plate-like material which is carried in a state of being conveyed to the surface of a conveying path by causing rollers supported in a state of being pressed against the conveying path to be periodically separated from the conveying path by a cam and a cam follower which move toward and away from each other. In a material feeder capable of intermittently feeding, at least one of the cam and the cam follower is insulated from the apparatus main body, a voltage is applied between the two, and a contact operation between the cam and the cam follower utilizes an energizing phenomenon. A rotational position detecting means is provided on the crank, and the rotational angle of the crank when the cam and the cam follower come into contact is detected from the rotational position signal of the crank and the energization phenomenon between the cam and the cam follower. And a display means for displaying the rotation angle thereof.